Rainbow Storming Mantle

When you cast this spell, exile all permanents
you control that produced colored mana spend
to cast it. Return those permanents onto the
battlefield under their owner's control at the
beginning of the next end step.
Enchanted creature has ''{t}: Add one mana of
any color a permanent you control can produce.
Then, Rainbow Storming Mantle deals 1 damage
to any target for each different color of mana this
ability could have produced but didn't.''